Pump.



PATENTED NOV. 28, 1905.

w. H. SHAFER.

PUMP.

APPLICATION FILED 11211.20, 1905.

2 SHEETSSHEET 1.

- man a wamassas W/Y/iam H. \Vuxfer: INVENTOR,

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PATENTED NOV. 28, 1905.

2 SHEETS-SHEET 2.

No. 805,586.v

W. H. SHAFER.

PUMP

APPLICATION FILED APR. 20. 1905.

W1 TN assas.

UNITED STATES PATENT OFFICE.

WILLIAM H. SHAFER, OF CINCINNATI, OHIO, ASSIGNOR TO THE AHRENS FIREENGINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

PUMP.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed April 20, 1905. Serial No 256,627.

To all w/wm it may concern:

Be it known that I, WILLIAM H. SHAFER, a citizen of the United States,residing at Cincinnati, Ohio, have invented a new and useful Improvementin Pumps, of which the following is a specification.

My invention relates to pumps of the dupleX double-acting class adaptedto use in fireengines and elsewhere; and the objects of my improvementare to place certain valves in recesses formed in the channels toprevent them from obstructing the currents, to locate thesupply-openings in an unobstructed line, to form the different chamberson curved lines to avoid conflicting currents, and to dispose thevarious chambers in a single integral structure in such manner as toobtain maximum capacity and efiiciency with the most compact, rigid, anddurable form of construction. These objects are attained in thefollowing-described manner, as illustrated in the accompanying drawings,in which- Figure 1 is a plan, with parts in section, on the line w w ofFigs. 2 and 3, of a pump of the designated class embodying myimprovements; Fig. 2, a vertical section on the line a a of Figs. 3 and4; Fig. 3, a front elevation, with parts broken away and parts insection, on the line y 1 of Fig. 4E; and Fig. 4, a plan, with the headremoved and parts in section, on the line a z of Fig. 3.

In the drawings, the pump-body 5 consists of intersecting verticalcylinders 6 and 7, formed integral with each other and withdischarge-chamber 8. The cylinders are provided with removable heads 9and 11 and the chamber 8 with removable front wall 12. Said chamber isformed with discharge-openings 13 in its opposite ends each adapted tothe engagement of a hose therewith and with a central top opening 14,which communicates with an ordinary air-chamber. (Not shown.) Parallelpartitions 15 and 16, formed within the cylinders, terminate in verticalwall 17 parallel with and joined to the rear wall 18 of thedischarge-chamber by a narrow middle partition 19. They separate thecommon suction-chamber 21 from the independent top and bottompulsation-chambers 22 and 23, located in the ends of the cylinders onopposite sides of the middle wall 24:. Pump-barrels 25, concentric withthe respective cylinders, are each provided with a plunger 26, which maybe reciprocated therein in the usual manner by means of a duplex engine,(not shown,) preferably having quartering strokes. They each extendthrough the suction-chamber and terminate in open ends withincorresponding pulsation-chambers.

Recesses or offsets 20 are formed in partitions 15 and 16 on one side ofthe throat or channel 27 of the respective pulsation-chambers which leadto the dischargechamber through the corresponding groups of valvedopenings 28, formed in rear wall 18. Valved openings 29 within saidrecesses do not choke or obstruct the respective channels 27, and,together with valved openings '31, they are disposed in circlesconcentric with the respective ends of the pump-barrels and lead fromthe suction-chamber to the respective pulsation-chambers throughpartitions 15 and 16. Supply-pipes 32, in registration with each other,are each adapted to the engagement therewith of a suction-hose andformed with an opening 34, which communicates with an ordinaryvacuum-chamber. (Not shown.) They communicate with the rear portion 35of the suction-chamber on a line tangent to the pump-barrels to avoidany obstruction thereby to admission of the water to the interior of thesuction-chamber. Hand-actuated emergency-valve 36 serves to open orclose passage 37 between the suction and discharge chambers. Y

In operation the downward movement of either plunger draws the waterthrough the appropriate circle of valved openings from the suction tothe corresponding top pulsation-chamber and simultaneously drives thewater from the corresponding bottom pulsation chamber through thecorresponding group of valved openings to the interior of thedischarge-chamber. The upward movement of either plunger in like mannerfills the corresponding bottom pulsation-chamber and simultaneouslydrives the water from the top pulsation-chamber to the interior of thedischarge-chamber. Either plunger may be actuated independently of theother, but by synchronizing the strokes quartering the most constantstream will be maintained through the discharge-chamber. The pumpbarrelsdo not obstruct the admission of water to the suction-chamber nor thevalves in the recesses its passage to the discharge-chamber, wherebyincreased valve area is obtained. The cylindrical walls of the suctionand pulsation chambers facilitate the movement of water therein andobviate counter currents. The smallest increase in the efiiciency ofpumps of this class which will cause them to perform increased dutiesand surpass the high standard of excellence of the present state of theart adds greatly to their value and desirability.

What 1 claim as my invention, and desire to secure by Letters Patent,is-

1. The combination of a suction-chamber, a pulsation-chamber, apartition between them having valved openings in different parallelplanes, a pump-barrel provided with a plunger, a discharge-chamberhaving a dischargeopening and separated from the pulsationchamber by avalved partition, and an emergency-valve in said partition.

2. The combination of a substantially cylindrical body, parallelpartitions therein each having valved openings in different parallelplanes and separating a middle suction-chamber from top and bottompulsation-chambers, a pump-barrel extending through the suctionchamberconcentric with the body and terminating in open ends within therespective pulsation-chambers, a reciprocating plunger therein, asupply-pipe communicating with the suction-chamber on a line tangent tothe pump-barrel, a discharge-chamber and a vertical partition havinggroups of valved openings leading thereto from the respectivepulsation-ohambers.

3. The combination of a body formed of two intersecting cylinders, adischarge-chamber integral therewith, pump-barrels concentrio with thecylinders, plungers therein, valved partitions separating from a commonsuction chamber, pulsation-chambers communicating with the respectiveends of each barrel, valved ofisets formed in the partitions channelsleading from the respective offsets to the discharge-chamber, a valvedpartition adjacent to the offsets and parallel with the barrelsseparating the pulsation-chambers from the discharge-chamber.

4. In a pump, the combination of a body, a barrel therein, and a valvedpartition extending between them and formed with different valvedportions in parallel planes, for the purpose specified.

5. A pump of the designated class having in combination a body, a barreltherein, a valved partition extending between the body and the barreland a valved offset formed therein and in a plane parallel therewith,for the purpose specified.

6. A pump of the designated class having in combination, a cylindricalbody, a concentric barrel therein parallel valved partitions extendingbetween the body and the respective ends of the barrel, said partitionsbeing each formed with a valved ofiset in registration with the otherand in a plan parallel therewith, whereby increased valve area isobtained without interfering with the passage of water to thedischarge-chamber from the pulsation-chambers.

WILLIAM H. SHAFER.

W'itnesses:

ALBERT A. MoEBUs, R. S. CARR.

